Which of these solutions will have highest boiling point?
1) 0.20 m glucose
2) 0.10 m Na2SO4
3) 0.25 m sucrose
4) 0.10 m NaCl
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Which of these solutions will have highest boiling point?
1) 0.20 m glucose
2) 0.10 m Na2SO4
3) 0.25 m sucrose
4) 0.10 m NaCl
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Answer: 2) 0.10 m
Explanation:
Elevation in boiling point is a colligative property which depends on the amount of solute.
= elevation in boiling point
i = Van'T Hoff factor
= boiling point constant
m = molality
1. For 0.20 m glucose
i= 1 as it is a non electrolyte and does not dissociate.
Thus concentration of ions = 0.20
2. For 0.10 m
i= 3 as it is a electrolyte and dissociate to give 3 ions.
Thus concentration of ions =
3. For 0.25 m sucrose
i= 1 as it is a non electrolyte and does not dissociate.
Thus concentration of ions = 0.25
4. For
i= 2 as it is a electrolyte and dissociate to give 2 ions.
Thus concentration of ions =
Thus as concentration of ions is highest for , the boiling point will be highest.